service procedures have changed on new cars. GM is doing away with the ability to reset the system by dropping or adding pressure to each wheel. they want to make it so you take the car to the dealer for everything. however, for people that still want to perform tire rotations at home, they came out with the tool listed.

the magnet trick only works on a few cars, including the corvette and cadillac Deville, and maybe a few others. air pressure change will not work on new cars, i know 2012 and up. not sure on 2011's. you will have to try and figure out if it works. we use TPM reset tools, which can be purchased from kent moore, or napa, or any tool company. most cost around 200-700 depending on model and features.

the one listed used to be 43.00 and has gone up in price recently. probably because of high demand.

you can enter the relearn mode on the impala by putting the ignition to the accessory position, and pressing and holding the lock and unlock buttons on the key fob. you will hear 2 audible horn beeps, and then the system is in learn mode. then start at left front, then move to right front, then right rear, then to left rear. when each tire is learned, the horn will beep, and after the system has been relearned it will beep twice. turn the key off, and start the vehicle. no TPM light should be on.
you will need to place the antenna of the TPM tool on the tire by the valve stem, or at the tip of the valve stem, depending on the tool.
or option 2 is the use of the tech 2/tech 2 win. listed under RCDLR special functions/TPM relearn mode.

or option 3, the dealer can reset it for you. usually does not cost anything to do this, as it can be done easily and quickly.